Synonyma: Alnus americana, Alnus canadensis, Alnus glauca, Alnus incana f. tomophylla, Alnus incana subsp. rugosa, Alnus incana var. americana, Alnus incana var. glauca, Alnus incana var. tomophylla, Alnus rugosa f. emersoniana, Alnus rugosa f. hypomalaca, Alnus rugosa f. tomophylla, Alnus rugosa var. americana, Alnus serrulata var. rugosa, Betula alnus…